Curated Tumblr

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Hungry 9 (lemmy.likes.cat)

submitted 2 months ago by [email protected] to c/[email protected]

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[–] [email protected] 4 points 2 months ago (1 children)

I just memorized any addition with 9 adds a 1 in front while reducing the other number by one. Same general step, but there's no 10 in my head, just 9+7 -> 16. Basically, promote the tens column while demoting the ones column. I think of it more like a mechanical scoreboard (flip one up, flip the other down) than an operation involving a 10.

If it's anything other than 9, I fall back to rote memorization, unless the number is big, in which case I'll do the rounding to a multiple/power of 10.

[–] [email protected] 2 points 2 months ago

Yeah that's a more accurate description of what i actually do in my head to. I'm not "adding 10", because I already would use a short hand method for adding 10 anyway to promoting the tens place or flipping the score card, as you said.